A walnut Piano Stool with iron fitting stamped H. Brook Patent, London to adjust the seat height.
The seat can be raised by 3 1/2 inches by turning the 2 turned walnut knobs to the sides. The seat has a figured walnut veneer on plywood apron below the upholstery which covers the beech secondary wood which is painted to resemble walnut. The turned and fluted walnut legs have wooden threads to allow them to be removed for ease of transport. It would not be uncommon for musicians to travel in their work and such a portable stool would be useful. It is likely the maker is Henry Brooks. The design of this stool is very sturdy and the raising action clever. It has been reupholstered in green leather. Circa 1875.
More can be read on Brooks in Makers.